Rebecca Adlington (top with red hat) on her way to finishing third in the womens 400m freestyle on the second day of the 2012 Olympics in London. Set new record See Usain Bolt 100m video http://www.joggingtoloseweight.org/olympics-star-usain-bolt/

London 2012 Olympics: Usain Bolt should retire from athletics now to protect his legacy

I think people are fantasising when they talk about Usain Bolt running the 400m in Rio in four years time. They are trying to find new things for him to do, new records for him to break when the reality is that he should probably quit while he is on top of his game.